496ci revamped

Grumpy

The Grumpy Grease Monkey mechanical engineer.
Staff member
most guys I know use a can of starting fluid ether to start race engines
a couple squirts of fog in the intake and you fire up, and combustion chambers heat up and your good to go.

gumout-car-fluids-chemicals-5072866-64_1000.jpg
 

T-Test

solid fixture here in the forum
How many do you think will read that info BEFORE they understand what Happened to their engine?
 

Grumpy

The Grumpy Grease Monkey mechanical engineer.
Staff member
I have guys come into my shop with spark plugs with over 100 K miles on them,
and asking if its really necessary to swap them out...
any concept of tuning , knowledge or related info,
to most tuning, engine function, reading spark plugs,
using an infrared gun to read exhaust temps, use of a vacuum gauge,
changing ignition advance curves, is almost a black art/magic
 

Speedlink1973

Well-Known Member
I have guys come into my shop with spark plugs with over 100 K miles on them,
and asking if its really necessary to swap them out...
any concept of tuning , knowledge or related info,
to most tuning, engine function, reading spark plugs,
using an infrared gun to read exhaust temps, use of a vacuum gauge,
changing ignition advance curves, is almost a black art/magic
I still read plugs but efi allows you to adjust fuel and timing with a couple of taps of the display.
My understanding is reading plugs
Gas vs ethanol are different
So I will have to dig around and find some photos of plugs
 

Maniacmechanic1

solid fixture here in the forum
Why? Because of spark
Only way to make a Vertex magneto work is to use Alpha Numeric programs.
Just the TPS is used.
Coolant temp also.

Think it's done that way yet on Street Outlaws like Murder Nova and The Crow.

How Pro Stock did EFI Years back.
WOT Concern only.

No good for street cruise.
 

Speedlink1973

Well-Known Member
Okay back to compression guys..
So I went and got new and better compression gage and did compression test cold with all the plugs out, last time
I did it with all but one plug in it
And it's 210 to 215 on all eight cylinders
With new cam intake closing at 76°
Umm... dynamic compression seems to be thru the roof
 

Grumpy

The Grumpy Grease Monkey mechanical engineer.
Staff member
hows the cam indexed<
if its dot-to-dot rather than having been dialed in, chances are excellent its installed 4 degrees advanced,
from split over-lap or strait up, if you RE-installed it 4 degrees retarded,
from split over-lap or strait up,the whole power curves likely to move about 300 rpm higher ,
in that 496 displacement, but the dynamic compression will drop,
generally a good change in a 496 BBC,
if your running E85 that compression may not be a bad thing?

http://garage.grumpysperformance.co...ectly-and-get-it-to-last-cam-install-info.90/

http://garage.grumpysperformance.com/index.php?threads/the-mechanics-of-adv-ret-a-camshaft.4532/

http://garage.grumpysperformance.co...lsa-effects-your-compression-torque-dcr.1070/

http://garage.grumpysperformance.co...im-good-to-go-on-valve-clearance-right.15160/

http://garage.grumpysperformance.com/index.php?threads/how-to-pick-timing-gear-set.4548/

http://garage.grumpysperformance.co...uild-the-engine-to-match-the-cam-specs.11764/

http://garage.grumpysperformance.co...-the-charts-calculators-and-basic-math.10705/
 

Maniacmechanic1

solid fixture here in the forum
Its going to Hit harder with 215 cranking PSI.
I like 290 -310 psi cranking. No Pump Gas. 110 Motor Octane race gas or similar Race fuel motor octane.

190-195 psi cranking pretty much the limit on 93 RM/2 documented by David Vizzard.
190-195 psi cranking what I have on the 63 Gp. Runs on 87 fine with Total ignition timing set at 33 degrees BTDC.
I think it pulls it off because of the High Rod to Stroke ratio 425 has.
7.0"C-C.
3.9375 " stroke.
1.778 R/S

Learned to work with whatever you have.
Trying to Doctor too much not worth it.
Needs High Octane fuel, Give It what it wants.
 

Speedlink1973

Well-Known Member
hows the cam indexed<
if its dot-to-dot rather than having been dialed in, chances are excellent its installed 4 degrees advanced,
from split over-lap or strait up, if you RE-installed it 4 degrees retarded,
from split over-lap or strait up,the whole power curves likely to move about 300 rpm higher ,
in that 496 displacement, but the dynamic compression will drop,
generally a good change in a 496 BBC,
if your running E85 that compression may not be a bad thing?

http://garage.grumpysperformance.co...ectly-and-get-it-to-last-cam-install-info.90/

http://garage.grumpysperformance.com/index.php?threads/the-mechanics-of-adv-ret-a-camshaft.4532/

http://garage.grumpysperformance.co...lsa-effects-your-compression-torque-dcr.1070/

http://garage.grumpysperformance.co...im-good-to-go-on-valve-clearance-right.15160/

http://garage.grumpysperformance.com/index.php?threads/how-to-pick-timing-gear-set.4548/

http://garage.grumpysperformance.co...uild-the-engine-to-match-the-cam-specs.11764/

http://garage.grumpysperformance.co...-the-charts-calculators-and-basic-math.10705/
Yes Grumps, it's straight up but degreed in intake 108 exhaust at 115 3/4° is what it came out to be.
And yes it has 4° advance ground in it
 
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Speedlink1973

Well-Known Member
It is now switched to liquid corn (e85)
To bad it's pouring rain out..
New pump walbro 525 lph for e85
And replaced all my foam in fuel cell
Everything else is already setup for it.
 
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Maniacmechanic1

solid fixture here in the forum
It is now switched to liquid corn (e85)
To bad it's pouring rain out..
New pump walbro 525 lph for e85
And replaced all my foam in fuel cell
Everything else is all ready setup for it.
Raining off and on here too.
Was outside tinkering rejecting the Holley 4bbl..got wet but kept working.
No good for a power test drive weather.
 

Grumpy

The Grumpy Grease Monkey mechanical engineer.
Staff member
yes let us know how it runs once you get to go out and play with it,
on a nice long strip of open road surface, where you can accelerate for 8-9 seconds under load.
 

Speedlink1973

Well-Known Member
yes let us know how it runs once you get to go out and play with it,
on a nice long strip of open road surface, where you can accelerate for 8-9 seconds under load.
Well Grumpy it's impressive.
According to duty cycle, fuel pressure at 51psi
And 80lbs injectors on e85
It's 692 flywheel hp with exhaust on
Hopefully a test and tune next Wednesday at Muncie drag way in Muncie Indiana
I've been driving it last two days to work and back 25 miles round trip. At 110° outside temp. Car temp 190 192 max
 

johnnmo

Active Member
I have guys come into my shop with spark plugs with over 100 K miles on them,
and asking if its really necessary to swap them out...
any concept of tuning , knowledge or related info,
to most tuning, engine function, reading spark plugs,
using an infrared gun to read exhaust temps, use of a vacuum gauge,
changing ignition advance curves, is almost a black art/magic
I had a neighbor who couldn't get her truck started last winter. dodge 5.9 magnum 163,000 miles. It had original plugs wires cap and rotor!
Put new ones on it and she said it never ran this good!
Surprised it ran that long.
 

johnnmo

Active Member
Its going to Hit harder with 215 cranking PSI.
I like 290 -310 psi cranking. No Pump Gas. 110 Motor Octane race gas or similar Race fuel motor octane.

190-195 psi cranking pretty much the limit on 93 RM/2 documented by David Vizzard.
190-195 psi cranking what I have on the 63 Gp. Runs on 87 fine with Total ignition timing set at 33 degrees BTDC.
I think it pulls it off because of the High Rod to Stroke ratio 425 has.
7.0"C-C.
3.9375 " stroke.
1.778 R/S

Learned to work with whatever you have.
Trying to Doctor too much not worth it.
Needs High Octane fuel, Give It what it wants.

My brother use to run a 454 monte carlo with 260 cranking compression on the street premium gas mid 1970's real torque beast.
 
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